Quaternary paleogeography of Western Beringia (vegetation and soil cover) Investigation Late Pleistocene paleosols and fossil mammal nests to reconstruct late Quaternary vegetation responses to climate change. Research of the mammoth remains and containing them deposits for vegetation reconstruction and food preferences of mammoth fauna. Reconstructions vegetation dynamics in the landscape and at archaeological sites Ecological investigation of modern rodents and modern soil of tundra zone Phytoliths morphology of wild and cultivated plants.